Your brain can't handle walking and using your phone at the same time — so look up.

Safety adviser Murali Krishnan points out that walking and using your phone both demand large amounts of cognitive effort.

As a result, you can't fully focus on both at the same time in the same way you can with walking and gum-chewing, for instance. You'll suffer "inattention blindness," where you may see an object but not process that it's a car speeding toward you.

Eliminate your car's blind spots by adjusting your mirrors properly.

By adjusting your mirrors so that you barely see the edges of your own car, you can effectively eliminate the blind spots on the sides of the vehicle. The rear-view mirror should be able to locate any car behind yours. It's worth the few seconds it takes to adjust these when you get in the driver's seat.

Heat transfers faster through liquid than gas, so keep warm by staying dry.

To ensure your body temperature doesn't fall too quickly in cold environments, invest in clothes made of wool instead of cotton — they'll absorb more moisture so that dampness doesn't linger on your skin. And, of course, do your best to stay dry.

If your plane makes a water landing, your best bet is to inflate your life jacket after you exit the plane.

User Alvin Yip warns against the impulse to inflate your life jacket immediately if a plane is making an emergency landing on water. The water that could rush into the cabin makes it harder to move if you're more buoyant.

So swim to an exit, then inflate your jacket to stay afloat.

You can perform the Heimlich maneuver on yourself.

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Few people realize that they don't need someone else to dislodge a piece of food from their throat.

Hitting someone with a stick could prevent them from fatal electrocution.

Electrocution instantly causes the muscles in a person's body to tense up. This is dangerous because it means a person holding a live wire can't let go.

Ideally, you'll be able to turn off the source of the electricity in this kind of situation, Alex Elderfield explains. But if that's not possible, you can help the person (without getting electrocuted yourself) by breaking the circuit. The simplest way to do that is to find a long hard object, like a stick, and give the person a firm whack.

If you get stabbed or impaled by a sharp object, leave it be.

Pulling out an object that has been lodged in your body will increase the rate of blood loss, Thomas Mei explains. Instead, try to cover the wound and do anything you can to stop the bleeding until you find a medical professional.

Most airplane crashes happen within the three minutes after take off or eight minutes before landing.

According to Sanket Shah, aviation safety abides by the +3/-8 rule, which encourages people to be vigilant immediately after take off and right before landing — 80% of crashes happen during those times.

You can use those short periods of time to stay alert and locate exits rather than getting lost in a podcast or movie.

A bright flashlight could be your greatest weapon against an attacker.

Instead of using mace or a weapon, an extremely bright flashlight can also effectively ward off a mugger, user Sanket Shah claims.

"If you have someone approaching you that seems aggressive, in the gravest extreme, a blast of 300+ lumen to the eyes (especially at night) will give you the opportunity to get out," he says. "And suppose you miss-read the situation; no one is really harmed and you can't get in trouble for it."

If you get lost on a hike, try to find a fence or stream.

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"The stream always flows downhill and invariably will reach a larger tributary or a body of water," says user Jon Mixon.

Meanwhile, the fence will almost always lead to a road or a structure.

Use condoms as makeshift water storage.

Condoms are incredibly elastic. As user Janis Butevics points out, you can use that to your advantage if you need a quick way to store large volumes of water. They essentially act like bladders and are capable of holding a gallon of water.

"They can also be used to protect against water, as a stretchable cover for valuable items like matches and walkie-talkies," Butevics says.

Picking out exits ahead of time will cut through your "normalcy bias."

When local governments send out warnings about natural disasters, many people stay put even when told to evacuate. As John Ewing explains, psychologists call the phenomenon the "normalcy bias." It refers to people's tendency to think everything will turn out OK even when they're clearly in danger.

Ewing says people can break out of their normalcy bias cycle by locating multiple exits when they're out in public, such as at the movies or in a restaurant. Mentally preparing for a dangerous situation will train you to be vigilant.

Downed power lines are lethal.

As Cal DeBouvre explains, the voltage in a downed power line is high enough to push electricity through the dirt nearby. "If you spot a downed power line walk the other way and call the police immediately," he says.

If a line falls near you, keep your feet together and jump or shuffle away. If you take normal steps, you're at risk of conducting electricity in your body since the current can flow through both legs separately.